1.

For a diprotic acid, which of the following is true for 1^(st) and 2^(nd) ionization constants (K_(a_(1)) and K_(a_(2)))

Answer»

`K_(a_(1)) = K_(a_(2))`
`K_(a_(1)) gt K_(a_(2))`
`K_(a_(2)) gt K_(a_(1))`
`K_(a_(2)) ge K_(a_(1))`

Solution :`K_(a_(1)) gt K_(a_(2))`
The reason for this is that it is more DIFFICULT to remove a positively charged PROTON from a negative ION due to ELECTROSTATIC forces.
For e.g., `H_(2)X_((AQ)) overset(K_(a_(1)))hArr H_((aq))^(+) + HX_((aq))^(-)`
`HX_((aq))^(-) overset(K_(a_(2)))hArrH_((aq))^(+) + X_((aq))^(2-)`


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